No need to do a dratsic water change just because of cyano.
What you do need to do is a 10% change every week. Other than that keep everything the same and the problem should go away on its own. (do increase your rock if you are going full reef though) Especially with a weak skimmer, you should be doing weekly water changes.
You can also run carbon.
When you get your sump running, consider a macro algae fuge, and something like an ASM skimmer.
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